The reward over the shooting of two horses in a pasture in Hall County, Georgia, has grown to $US7500.

The Humane Society of Northeast Georgia (HSNEGA) confirmed on its Facebook page that the reward has grown from $US5000 to the new mark after another donor came forward with $US2500.

Deputies with the Hall County Sheriff’s Office are investigating the shooting, which left a 15-year-old Tennessee walking horse named Rox dead from five gunshot wounds and another animal, a 14-year-old quarter horse named Junior, wounded.

Junior survived a single gunshot wound to the neck.

Deputies received the call on March 29 to the 6700 block of West County Line Road, in Lula, after a family member at the property found the dead animal.

Investigators are requesting the public’s help in providing information about the shooting, and are urging them to contact investigator Scott Lilly at 770-531-6879.

No motive has yet been established for the attack, in which a small-calibre firearm was used.